BIOLOGICAL BULLETIN 



OF THE 



firmrine Biological laboratory 



WOODS HOLE, MASS. 



lEMtorial Staff 



E. G. CONKLIN Princeton University. 



JACQUES LOEB The Rockefeller Institute for Medical Research. 



GEORGE T. MOORE The Missouri Botanical Garden. 



T. H. MORGAN Columbia University. 



W. M. WHEELER Harvard University. 



E. B. WILSON Columbia University. 



Managing EMtor 



FRANK R. LILLIE The University of Chicago. 



VOLUME XXX. 



WOODS HOLE, MASS. 

 JANUARY TO JUNE 1916 



